Electromagnetic Shielding Techniques in the Wireless Power Transfer System for Charging Inspection Robot Application

Abstract

Aiming at eliminating the leakage of magnetic fields from the wireless power transfer (WPT) system, the structural and working characteristics of the WPT system for the inspection robot are analyzed and an electromagnetic shielding method combining passive shielding and active shielding is proposed in this paper. Firstly, we simulated the magnetic field distribution of the WPT system in Maxwell. Secondly, passive shielding is configured in the WPT system, and the material, size, and position of the passive shielding are studied. Then, we add active shielding to areas where passive shielding cannot achieve a good shielding effect. Based on the analysis and summary of the two methods, we shield the WPT system in the horizontal direction with the appropriate size and distance of aluminum plate, and in the vertical direction, we use the active shielding coils. Simulation and experimental results show that the scheme only slightly reduces the transmission efficiency of the system (from 80.2% to 77.6%), but the shielding ability is 34.06% higher than that of only aluminum plates. The excellent effect of the proposed shielding method is verified in our experiment.

An Empirical Survey on Wireless Inductive Power Pad and Resonant Magnetic Field Coupling for In-Motion EV Charging System

“…The available electromagnetic shielding techniques for the WRIPT system for charging unmanned aerial vehicle application is investigated. As a result, EMI is experimentally analyzed and simulated to confirm the shielding method significantly reduces the magnetic field by almost 85% for the WRIPT system [158]. To evaluate the EMI safety of multiple WRIPT EV charging systems and to explore simple, effective EMI protection methods, the simulation analysis was made using COMSOL Multiphysics software.…”

Design Methodology and Circuit Analysis of Wireless Power Transfer Systems Applied to Electric Vehicles Wireless Chargers

“…Furthermore, the induced eddy current in this metal aid in preventing the leakage flux. Hence, the filed lines between coils are confined and the leakage flux to the surroundings is reduced [27].…”